Improved scaffold



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EDWARD Il. HOLZER, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 102,542, dated May 3, 1.870; antedatel Apr/Z 29, 1870.

IMPROVE!) SCAFELD.

The Schedule referred to in these :Letters Patent and making pait of the saine I To all whom it may concern:

Be it known that I, EDWARD R. Homan, of the city and county of Philadelphia, and State lof Pennsylvania, have, invented a new and useful Improvement in Scaolds; and I do herebyldeclare that the following is a4 full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawing making a part of this speciiication.

This inventionA is an improvement on the scaiold patented by me under date of May 12, 1868, and consists in securing the posts in a vertical position, by means of a sill-'piece made adjustable, so as to suit any size window, and extension-plates connected with sliding straps on the posts.

Also, attaching to the edge and ends of the platform canvas screens, for -the purpose of protectin-g the work and workmen from high winds and flying dust.

The canvas placed' along the edge also prevents the sand used in rough-casting building-fronts from falling and scattering over persons beneath the scaffold.

Figure l is an end elevation of my improvement Ain scaffolds.

Figure 2 is a plan view of same.

Figure 3 is a plan view of the adjustable sill-piece.

Figure 4 is a sectional view of a portion .of one of the frames used.

Figure 5 is an edge view of the platform, showing the manner of securing the canvas. Y

To enable thoseskilled iu the art to make and use my invention, I will now proceed to describe its construction and operation.

Formed in the opposite sides of post A are grooves g, for receiving the bent ends of the sliding strap S.

rPhe said strap ts closely to the back part of the post, and is provided on each corner with a socket, into one of which is inserted and works the pin on the end of the extension-plate P.

This plate is made in two or more parts, connected together and sliding in and ont by means of suitable slots and thumb-screws, and has formed on its opposite end a pin, which engages in openings made in the sill-piece B.

The sill-piece B is made-in three sections, I), b', a d b2.

The central one, b, is narrower than the other two sections, and has its edges beveled, and ts into corresponding reeessesformed in the sections b and b2.

Immediately below the section b1, and secured in the approaching ends ofthe sections b and b2, aretwo guide-rods, r and 1".

One end of rod r is secured in the section b, and the opposite end litt-ing and sliding in a slot formed va rope which lits the groove.

of sufficient depth in the en d of section'l; the rod 'r' is secured to section b2, and works in sect-ion b 'in a similar manner.

'lhus constructed it (the sill-piecel is applicable to any width of window, and when extended, is held apart byl means of set-scre\vs.

The sill-piece B is applied to the window-sill, and is extended so as to t closely in th'e frame, y where it is held by means of the offsets formed on the ends of sections b and b2.

The post A is then elevated to a vertical position, and the sliding strap S, carrying with it thecxtension-plate P, is moved to the proper position,.where it is secured by means of a set-screw, D.

The projecting end of plate P is then hooked into one of the openings formed in the sill-piece B, the block is lengthened or shortened according to the width of 'the window and the distance that the posts are placed apart, as shown in fig. 2.

A frame, composed of .the upright pieces p and p1 and cross-pieces p2 and p, is applied on top and near each end of thc platform F,the upright piecesl p and p1 being connected to the bottom piece 1) by means of straps Tand T', secured over their lower ends.

The said straps have each a pin, provided wit-h a thread formed on their lower side, which projects through a slot cut iu the piece p, and are secured by A i means of set-screws D'1 and D?, so as to be moved in and out.

Secured in the platform F is a set-screw, D3, which passes up through the slot formed in the cross-piece p, in order to allow the frame to be adjusted on the platform.

Secured to the framing-pieces p, pl, p2, and 1)", by means o f a groove `formed in the inside edges, is a canvas screen, C, and on the edge of and extending the whole length of the platform F, is a screen, C'.

The groove for securing the said screen to the platform is made somewhat circular in form, and partially covered by means of a strip, I, andthe canvas sewed to This screen collects the sand and prevents it and other material from dropping down on persons beneath lthescatfold.

The platform I" can be adjusted so as to he slid in or out on the bracket-s by means of set-screws D4 and D5. l A

Having thus described my invention, its construction and operation,

That I claim, and desire to secure by Letters Patent of the United States, is-

1. vThe construction and arrangement of the sillpiece B, substantially as and for the purpose set forth.

2. The arrangement of the grooves gin thenpost A; also the strap S sliding therein, or their equivalent, whereby the extension-platte P or :t brace can be held and guided on the post so as to slide past the bracket without interfering with it.

3. In combination with the strap S and sill-piece `B, the construction and arrangement of the extension-plate P, as and for the purpose set forth.

4. The arrangement of the platform F, provided with frames composed of pieces 11, p1, p2, and p, straps 'l and T', set-screws D, D, D, D4, and Dias-:md for the purpose set forth.

5. Constructing the edge of the platform F,also the inner edges of the framing-pieces p and 111, or p and p, with grooves for inserting and securing the edges of the canvas screens C and C', as and for the purpose specied.

In testimony whereof have hereunto signed my name in the presence of two,subscribiug witnesses. EDXVARD R. HOLZER.

XVitnesses:

CHARLES H. EVANS, ISAAC R. OAKFOBD. 

